There are multiple launch points for optimism in watching a tiny home take shape on the garage-size turntables at Azure Printed Homes in a northeastern Denver warehouse. After the 3D printing robotic arms have applied their magic for about 24 hours, the result is a sturdy, solar-powered starter home or mountain cabin that is built for about 30% less money than a comparable tiny home. And 70% faster. Oh, and somewhere between 100,000 and 150,000 plastic bottles have been recycled into the walls.